Log-jacking mechanism for-saw-mills



2 Sheets-Sheet 2.

(N Model.)

J. P. HANsoN. LOG JACK'ING MEGHANISM POR SAW MILLS.V

Patentedfeb-12, 1884;

arriva rrrcn.

JAMES P. Hanson, on osHKosH, WISCONSIN.

LOG-JACKING MECHANISM FOR SAW-lVlll-LS.

SPECIFICATION-forming part of Letters :Patent `No. 293,245, dated February 12,` 1884. Application filed December 8, 1853. (No model.)

To all whom it may concern.-

B'e it known that I, JAMns IP. HANsoN, a citizen of the United States, residing at Oshkosh, in the county of Vinnebago and State of Wisconsin, have invented certain new and useful Improvements in Log-.lacking Machines for Saw-Mills, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in a logjacking machine for that class of sawmills in which the logs are drawn up an in` clined logway alongside of the log-carriage by an endless revolving chain, known asa bullchain, 7 or other equivalent devicepreparatory to being sawed. I

The object of my invention is to provide a device for automatically stopping` the log as it is being drawn into the mill at the desired point alongside of the carriage, and which will, as soon as said log is removed from the endless chain, cause said chain to commence its rotary movement again. i

The construction of my invention is explained by reference to the accompanying drawings, in which Figure 1A represents a side elevation, Fig. i 2 represents a ground plan, and Fig. 3 represents la detail.

Like parts are represented by the saine reference-letters throughout the several views.

A represents the log as it is being drawn into the mill byand upon the endless chain B preparatory to being sawed. Motion is communicated to said chain Bfromthe operative power of the mill through band C, pulley D, shaft E, friction-pulleys F and G, shaft'H, gears I and J, shaft K, and sprocket-gear L. One end of the shaft E is provided with a movable journal-box, M, which permits the shaft E andthe friction-pulley F to be moved slightly toward and from the shaft H, whereby the peripheries of the friction-pulleys F andG are brought together and separated. XVhen `the endless chain B is relieved of the weight of the log,the peripheries of said friction-pulleys F and G are brought in contact, and thus retained by the gravity i of the weight U acting through rope V, pulley C', lever S, link NV, and movable journal-box M, whereby said endless chain is set in motion and the logs placed thereon are drawn into the mill. As the logs are thus drawn to the desired position upon lthe endless chain'to be rolled-upon the carriage the front end of the log is brought in contact with the buffer T, whereby said buffer is thrown back, together with the sliding bar R. The rearward motion of the buffer T and bar R is communicated to the friction-pulley F, as hereinafter explained. The block T is supported upon the standardsh, h, which are pivoted upon the rod I. The end toward the left of bar R and brace K are pivotedto the upper end of the standards h h. The end of rod R toward the right is loosely fitted in a recess formed in the top of the post O', upon which post it is supported and guided.

J Jf are stops, which are rigidly attached to the bar R, and limit the leftward movement of said bar by contact with the side of the post O. The Aoffice of bari B is to both carry bar L and to move the buer T back and hold it in position after the log has been removed from the endless chain B, which backward motionis caused by the gravity of weight N acting through rope O, which rope passes around pulley l? and Q, and is Aattached to bar L.

H is a brake, which is brought in. contact with the periphery of the friction-wheel G,

and thus arrests its movement as soon as the friction-pulley F is thrown out of contact therewith. The lower end of the brakeH i is pivoted to ba'r w, and is inclined away from the friction-pulley G at such an angle that it is kept from contact with said pulley by its own gravity. The upper end ofthe brake H is provided on its respective sides with bars of strap-iron, I, which extend upward on the respective sides of the bars R and L.

Y is a pin, which extends through and projects from the respective sides of bar L, and is adapted to engage against the strap-irons I as said bar L moves toward the right, thereby forcing the brake H back against the frictionpulley G, and thus arrests the motion of said pulley as soon as it is relieved from contactwith the `pulley F. The arrangement of said friction-pulleys is such that a slight motion only of the lever S is required to engage or disengage IOO ping the backward motion of the bar L'.

their peripheries. To the upper end of the person below that another log is wanted, and

lever S is also attached a rope, B', which no delay is caused in waiting for logs, as is passes to the right, and is carried over the pulley D', and from thence toward the left alongside of the logway at a convenient height to be reached by the operator, whereby, if desired, he may,by drawing downward upon said rope, disengage the friction-pulleys and stop the log before it reaches the buffer T. The bar L is-retained upon the bar Rby the plates a a, which plates are rigidly bolted to the respective sides of said bar L at its ends, passing down on the respective sides of bar R, their lower ends bein-g connected together beneath the bar R by girds b b in such a manner as to permit said bar L' to slide freely upon said bar R. The upper left-hand end of bar L is provided with brackets E' and F', through the upper end of which brackets passes a loosely-tting rod, M". The rod M" is provided at its right-hand end with a screw and nut, by which the relative position of said barsR and Lmay be changed to each other by turning said nut toward thev right o-r left on said screw.

My invention operates as follows: As the log A is drawn into the mill upon theendless chain B, it is brought in contact with the buffer.T, moving the same back, together with bars R and L', whereby the arm T is brought in contact with the lever S and the frictionpulleys F and G are-thrown out of contact. Simultaneouslywith said backward movement the pin Y is broughtin contact with the strapirons I", which are rigidly attached to the upper end of brake H', thereby forcing said brake against the friction-pulley G, thus stop- If, however, thev momentum of the log carries it still farther toward the right, the bar R will be moved independently of the bar L', said movement being resisted bythe gravity ofthe w eight N until the log and bull-chain are brought to rest. As soon as the log is removed from the endless chain B, the weight N forcesbar R, buffer T, and rod M" back, when the nut on rod M strikes against the bracket F', which is rigidly attached to bar L', whereby said bar' L' is carried back with said nut, rst relieving brake H' from contact with the friction pulley T and permitting the lever S to be drawn toward the left by the gravity of the weight U, whereby the friction-pulleys F and G are brought in contact, and the endless .chain is started and continues to revolve until the succeeding log is drawn into the mill and brought in contact with the buffer, as previously mentioned.

The advantages of my invention are obvious, as I not only dispense with one person in the mill for stopping and starting the endless chain, but the log is also stopped with greater precision at the right time and place, and the is removed and notice communicated. to the endless chain is always started as soon as the log frequently the case when the starting of the chain is dependent upon the attention of a person. 1

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a log-jacking machine, the combination of a buffer against which the approaching log is adapted to be brought in contact, a stationary friction-pulley or equivalent from which motion is communicated by gears Yand shafts to the bull-chain, a movable frictionpulley or equivalent communicating with the operative power of the mill, and means for communicating motion from said buffer to said movable pulley, whereby said pulleys are separated by contact of the approaching log with said buffer and the bull-chain and log thereon automatically stopped at the desired point, substantially as set forth.

2; 'In a log-jacking machine, the combination of a stationary friction-pulley and means for communicating motion therefrom to the bull-chain, a movable pulley communicating through bars and levers with a movable buffer, against which the approaching log is adapted to be brought in contact andmoved in one direction, and weights suspended from ropes adapted through their connecting medium to bring said friction-pulleys in contact and move said buffer when relieved from the log in the opposite direction, thereby starting the bullchain, substantially as and for the purpose specied.

3. In a log-jacking machine, the combination of standards h h, buffer T, bar R, rod M, bar L', said bar L adapted to move on bar R, retaining-plates c a, cord O, as attached to bar L, and adapted to operate pulley Q in bar R, and pass beneath bar R, over pulley B, in post O', said rope being provided at its lower end with weight N, lever S, provided with rope V, from the end of which is suspended a weight, U, said bar L' being provided with brackets E and F', for the reception of rod M, arm T', adapted to be brought in contact with lever S, pin Y, adapted to communicate motion to the brake H', brake H', adapted to check the motion of the frictionpulley G, link YV, movable journal-box M, shaft E, band-pulley D, friction-pulleys F and G, shaft H, gears I-and J, shaft K, sprocketgear L, and bull-chain B, said shafts, pulleys, r and gears being adapted to communicate motion from said friction-pulley G to the endless chain, all substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

4 J. I. HANSON. Witnesses:

A. WILscN, Gno. W. BURNELL.

IOO

IIO 

